[
    {
        "schema": {
            "id": "http://some.site.somewhere/entry-schema#",
            "$schema": "http://json-schema.org/draft-04/schema#",
            "description": "schema for an fstab entry",
            "type": "object",
            "required": [ "storage" ],
            "properties": {
                "storage": {
                    "type": "object",
                    "oneOf": [
                        { "$ref": "#/definitions/diskDevice" },
                        { "$ref": "#/definitions/diskUUID" },
                        { "$ref": "#/definitions/nfs" },
                        { "$ref": "#/definitions/tmpfs" }
                    ]
                },
                "fstype": {
                    "enum": [ "ext3", "ext4", "btrfs" ],
                    "default": "ext3"
                },
                "options": {
                    "type": "array",
                    "minItems": 1,
                    "items": { "type": "string" },
                    "uniqueItems": true
                },
                "readonly": { "type": "boolean" }
            },
            "definitions": {
                "diskDevice": {
                    "properties": {
                        "type": { "enum": [ "disk" ] },
                        "device": {
                            "type": "string",
                            "pattern": "^/dev/[^/]+(/[^/]+)*$"
                        }
                    },
                    "required": [ "type", "device" ],
                    "additionalProperties": false
                },
                "diskUUID": {
                    "properties": {
                        "type": { "enum": [ "disk" ] },
                        "label": {
                            "type": "string",
                            "pattern": "^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$"
                        }
                    },
                    "required": [ "type", "label" ],
                    "additionalProperties": false
                },
                "nfs": {
                    "properties": {
                        "type": { "enum": [ "nfs" ] },
                        "remotePath": {
                            "type": "string",
                            "pattern": "^(/[^/]+)+$"
                        },
                        "server": {
                            "type": "string",
                            "oneOf": [
                                { "format": "host-name" },
                                { "format": "ipv4" },
                                { "format": "ipv6" }
                            ]
                        }
                    },
                    "required": [ "type", "server", "remotePath" ],
                    "additionalProperties": false
                },
                "tmpfs": {
                    "properties": {
                        "type": { "enum": [ "tmpfs" ] },
                        "sizeInMB": {
                            "type": "integer",
                            "minimum": 16,
                            "maximum": 512
                        }
                    },
                    "required": [ "type", "sizeInMB" ],
                    "additionalProperties": false
                }
            }
        }
    }]